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As fireworks exploded over Boston last night, three men were shot in Dorchester, part of a long weekend of violence that included at least 15 shooting victims.

One of the Dorchester victims was critically wounded in the shooting around 10 p.m. near 34 Norton St. The other two suffered minor injuries.

As of late last night, none of the victims in the weekend violence had died, but at least two had life-threatening injuries, police said.

Early yesterday morning, a man was shot several times just before 1 a.m. in Dorchester.

The victim, whose name was not released, was found in a car on Harvard Street, with gunshot wounds in the face, chest, and stomach, said Officer Eddy Chrispin, Boston police spokesman. The man was expected to survive.

Later in the evening, at about 7:15 p.m., a man was shot in the area of 60 Hollander St., Chrispin said. The man, whom he described as in his late teens or early 20s, was transported to Boston Medical Center with life-threatening injuries.

Chrispin said homicide detectives were investigating the shooting last night.

Just before midnight, a person was shot in Mattapan near Blue Hill Avenue and Morton Street and another was shot in Dorchester near Talbot Avenue and Washington Street. Both victims were taken to Carney Hospital, but police had no information on their conditions.

The violence continued early this morning, with two people shot on Columbia Road in Roxbury just after midnight, police said.

There were also several stabbings reported in the city yesterday, including one at 120 Huntington Ave. near the Prudential Center at about 11:30 p.m., police said.

City police historically see an increase in violent crime on summer weekends.

Last month, six of the seven homicide victims in Boston were killed between a Friday night and a Sunday.

Also yesterday, two men who had been found shot on Pierce Street in Hyde Park on Sunday evening were arrested in their hospital beds after police accused them of shooting each other. Both had been shot multiple times and taken to area hospitals with injuries that were not life threatening.

Police found both handguns believed to have been used in the shooting.

An investigation determined that the two had apparently shot each other during an altercation on the street. The first victim, police said, threw his gun into the middle of the road after he went down. The second victim ran down the street with a gun in hand, police said.

It was not clear who fired first, and police did not discuss a motive behind the confrontation.

Globe correspondents Derek Andersen and Jenna Duncan contributed to this report. John M. Guilfoil can be reached at jguilfoil@globe.com. Follow him on Twitter @globe_guilfoil